Ideally you don't need to resort to conditionals, but if you do, then there is no shame in drawing. Basically, you want to do whatever is fastest and gets you the right answer.
You pretty much have to rely on the conditionals, specifically how they say that if 1 and 3 are different, then 2 and 4 must be T, or how if 3 and 4 are T then P1. If you need help with a specific question I can try to help specifically